1 Cost Room Availability Passive Shielding Detector spheres for accelerators Radiation Detection and Measurement, JU, First Semester, 2010-2011 (Saed Dababneh).

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Presentation transcript:

1 Cost Room Availability Passive Shielding Detector spheres for accelerators Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

2 An experimental setup for accelerators R Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

3

4 An experimental setup for accelerators Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

5 An experimental setup for accelerators Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

6 An experimental setup for accelerators Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

7 An experimental setup for accelerators Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

8 An experimental setup for accelerators Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

9 An experimental setup for accelerators Low-energy ultra-weak resonance. 10 days beam on target. Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

10 An experimental setup for accelerators Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

Excitation Ionization ion-pair, suppress recombination in detectors. Energy loss 11 Interaction of heavy charged particles Electronic or nuclear (Rutherford, nuclear reactions, …) or radiative (Bremsstrahlung). Depletion layer. Delta rays and secondary electrons. Electron suppression for charge integration in accelerators. Faraday Cup. Tracks. Detectors mainly designed to make use of electronic interactions. SRIM Principles of Spectrometry Al in Al Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

12 Stopping power Stopping power Bethe-Bloch formula Minimum ionizing particles (mip). ~1/E Principles of Spectrometry Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

13 eV / Å keV /  m MeV / mm keV / (  g/cm 2 ) MeV / (mg/cm 2 ) keV / (mg/cm 2 ) eV / (1x10 15 atoms/cm 2 ) Units(conversion) You will encounter this when you run SRIM Principles of Spectrometry Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

14 Electron pick-up. ~1/E What about fission fragments????? Bragg curve stochastic energy straggling. Energy loss is a stochastic process, thus energy straggling. Principles of Spectrometry Target Accelerated beam Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

15 Principles of Spectrometry Accelerated beam Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

16 Range of charged particles Compare to gamma … !!! Range straggling? Mean and extrapolated range. An “old” idea to measure energy..! Surface barrier, PIPS. For a detector to register the full energy of charged particles, its thickness should be more than the range at that energy. Sometimes we look for partial energy. E-  E detection. position sensitive detectors. Energy and position sensitive detectors. Radioactive ion beams. Radioactive ion beams. Counts number Principles of Spectrometry Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

17 E-  E detection. Principles of Spectrometry Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

18 Use SRIM Data to reproduce the graphs. Energy deposited in an absorber (or detector). Or, if “thin” absorber: Both are not accurate. Why? You can do it better with SRIM. Principles of Spectrometry Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

19 Principles of Spectrometry Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

20Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).

21 Stopping time Problem…!! Detector response time. Effect on Doppler shift and broadening in nuclear reactions. Compare the application of scaling laws and Bragg-Kleeman rule with SRIM. Work out many examples. Ranges? Principles of Spectrometry Units? Applicability? HW 21 HW 22 Radiation Detection and Measurement, JU, First Semester, (Saed Dababneh).